#!/bin/sh

# invoke the right shell:

test -f /bin/ksh && test -z "$RUNNING_KSH" \
  && { UNAMES=`uname -s`; test "x$UNAMES" = xULTRIX; } 2>/dev/null \
  && { RUNNING_KSH=true; export RUNNING_KSH; exec /bin/ksh $0 ${1+"$@"}; }
unset RUNNING_KSH

test -f /bin/bsh && test -z "$RUNNING_BSH" \
  && { UNAMES=`uname -s`; test "x$UNAMES" = xAIX; } 2>/dev/null \
  && { RUNNING_BSH=true; export RUNNING_BSH; exec /bin/bsh $0 ${1+"$@"}; }
unset RUNNING_BSH

export PATH

# hack around a bug in zsh:
test -n "${ZSH_VERSION+set}" && alias -g '${1+"$@"}'='"$@"'

progname=tcfmgr

abort()
{
  echo "$progname: $@." >&2
  (exit 1); exit 1
}

mktexupd()
{
  setupMktexupd
  $TFC_MKTEXUPD "$@" >&2
}

# call mktexdir script, disable all features (to prevent sticky directories)
mktexdir()
{
  setupMktexDir
  MT_FEATURES=none $TFC_MKTEXDIR "$@" >&2
}

setupMap()
{
  case $setupMapOK in
    "") : ;;
    *) (exit 0); return 0;;
  esac
  
  case $TFC_MAP in
    "") TFC_MAP=`(kpsewhich -progname=texconfig -format='other text files' tcfmgr.map) 2>/dev/null`;;
  esac

  case $TFC_MAP in
    "") abort "config file \`tcfmgr.map' (usually in \$TEXMFMAIN/texconfig) not found";;
  esac

  if test ! -f "$TFC_MAP"; then
    abort "config file \`TFC_MAP' does not exist"
  fi
  setupMapOK=true
}

setupTemp()
{
  case $setupTempOK in
    "") : ;;
    *) (exit 0); return 0;;
  esac

  case $TFC_TEMP in
    "") TFC_TEMP=${TEMPDIR-/tmp};;
  esac

  if test ! -d "$TFC_TEMP"; then
    abort "temp directory \`$TFC_TEMP' does not exist"
  fi

  if test ! -w "$TFC_TEMP"; then
    abort "temp directory \`$TFC_TEMP' is not writable"
  fi
  setupTempOK=true
}

setupTexmfConfig()
{
  case $TFC_TEXMFCONFIG in
    "") TFC_TEXMFCONFIG=`(kpsewhich -var-value=TEXMFCONFIG) 2>/dev/null`;;
    *) (exit 0); return 0;;
  esac
  case $TFC_TEXMFCONFIG in
    "") abort "variable \$TEXMFCONFIG is not defined in texmf.cnf";;
  esac
}

setupMktexDir()
{
  case $TFC_MKTEXDIR in
    "") TFC_MKTEXDIR=`(kpsewhich --format='web2c files' mktexdir) 2>/dev/null`;;
  esac

  case $TFC_MKTEXDIR in
    "") abort "program mktexdir (usually in \$TEXMFMAIN/web2c) not found";;
  esac
}

setupMktexupd()
{
  case $TFC_MKTEXUPD in
    "") TFC_MKTEXUPD=`(kpsewhich --format='web2c files' mktexupd) 2>/dev/null`;;
  esac

  case $TFC_MKTEXUPD in
    "") abort "program mktexupd (usually in \$TEXMFMAIN/web2c) not found";;
  esac
}

writableCheck()
{
  setupTexmfConfig
  if test ! -d "$TFC_TEXMFCONFIG"; then
    mktexdir "$TFC_TEXMFCONFIG" >/dev/null 2>&1
    if test ! -d "$TFC_TEXMFCONFIG"; then
      msg="Directory TEXMFCONFIG=\`$TFC_TEXMFCONFIG' does not exist"
      (exit 1); return 1
    fi
  fi

  case "$relDir" in
    "") get_info;;
  esac
  if test -f "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE" \
     && test -w "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE"
  then
    (exit 0); return 0
  fi

  if test -d "$TFC_TEXMFCONFIG/$relDir"; then
    if test -w "$TFC_TEXMFCONFIG/$relDir"; then
      (exit 0); return 0
    else
      msg="Directory \`$TFC_TEXMFCONFIG/$relDir' is not writable"
      (exit 1); return 1
    fi
  else
    # we assume that a "mkdir -p" would work if the top-level
    # $TFC_TEXMFCONFIG is writable
    if test -w "$TFC_TEXMFCONFIG"; then
      (exit 0); return 0
    else
      msg="Directory \`$TFC_TEXMFCONFIG' is not writable"
      (exit 1); return 1
    fi
  fi
}

get_info()
{
  case "$TFC_FILE" in
    "") abort "missing --file option or empty argument";;
  esac
  setupMap
  # prepare + get info
  IFS=$TAB
  # set -- x `(awk '$1 == file' file=$TFC_FILE <$TFC_MAP) 2>/dev/null`; shift
  set -- x `(grep "^$TFC_FILE[ 	]" $TFC_MAP) 2>/dev/null`; shift
  IFS=$STD_IFS

  # assign results
  file="$1"
  relDir="$2"
  kpseFormat="$3"
  kpseProgArg="$4"

  # sanity checks
  case $file in
    "") abort "no info for file \`$TFC_FILE' in map \`$TFC_MAP'";;
  esac

  case $relDir in
    -) abort "no known standard location for file \`$TFC_FILE' in map \`$TFC_MAP'";;
  esac

  case $kpseProgArg in
    -) kpseProgArg=kpsewhich;;
  esac
}

check_out()
{
  if $createEmptyFile; then
    :
  else
    case "$orig" in
      "")
          get_info
          orig=`(kpsewhich -format="$kpseFormat" -progname="$kpseProgArg" "$TFC_FILE") 2>/dev/null`
          ;;
      *)
          test -f "$orig" || orig=
    esac

    case $orig in
      "") abort "file \`$TFC_FILE' not found";;
    esac
  fi

  # writableCheck needs to get a valid relDir, so it calls get_info if necessary
  if writableCheck; then
   : ok
  else
    cat >&2 <<eof

There was a problem finding a proper place to store configuration data.
The message was:
  $msg

To overcome such problems, set up the environment variable TEXMFCONFIG to
point to a directory tree that is writable to you, e.g.
  TEXMFCONFIG=\$HOME/texmf; export TEXMFCONFIG
or
  setenv TEXMFCONFIG \$HOME/texmf
eof
    (exit 1); exit 1
  fi

  setupTemp
  : ${TFC_ID=tfc$$}
  for d in "$TFC_TEMP/$TFC_ID" "$TFC_TEMP/$TFC_ID/in" "$TFC_TEMP/$TFC_ID/out"; do
    (umask 077; mkdir "$d") || abort "could not create directory \`$d'"
  done

  if $createEmptyFile; then
    (umask 022
     > "$TFC_TEMP/$TFC_ID/in/$TFC_FILE"
     > "$TFC_TEMP/$TFC_ID/out/$TFC_FILE")
  else
    cp "$orig" "$TFC_TEMP/$TFC_ID/in/$TFC_FILE" \
      || abort "copy \`$orig' -> \`$TFC_TEMP/$TFC_ID/in/$TFC_FILE' failed"

    cp "$orig" "$TFC_TEMP/$TFC_ID/out/$TFC_FILE" \
      || abort "copy \`$orig' -> \`$TFC_TEMP/$TFC_ID/out/$TFC_FILE' failed"

    chmod u+w "$TFC_TEMP/$TFC_ID/out/$TFC_FILE"
  fi

  cat >"$TFC_TEMP/$TFC_ID/relDir" <<eof
$relDir
eof

  cat > "$TFC_TEMP/$TFC_ID/file" <<eof
$TFC_FILE
eof

  echo "$TFC_ID $TFC_TEMP/$TFC_ID/in/$TFC_FILE $TFC_TEMP/$TFC_ID/out/$TFC_FILE $orig"
}

check_in()
{
  setupTemp

  if test ! -d "$TFC_TEMP/$TFC_ID"; then
    abort "directory \`$TFC_TEMP/$TFC_ID' does not exist. Perhaps missing arg --id"
  fi

  case "$TFC_FILE" in
    "") TFC_FILE=`(cat "$TFC_TEMP/$TFC_ID/file") 2>/dev/null`;;
  esac

  for f in "$TFC_TEMP/$TFC_ID/relDir" "$TFC_TEMP/$TFC_ID/file" "$TFC_TEMP/$TFC_ID/in/$TFC_FILE" "$TFC_TEMP/$TFC_ID/out/$TFC_FILE"; do
    if test ! -f "$f"; then
      abort "Oops! file \`$f' does not exist"
    fi
  done

  if (cmp "$TFC_TEMP/$TFC_ID/in/$TFC_FILE" "$TFC_TEMP/$TFC_ID/out/$TFC_FILE") >/dev/null 2>&1; then
    (exit 0); return 0
  fi

  setupTexmfConfig
  relDir=`cat "$TFC_TEMP/$TFC_ID/relDir"`
  if test ! -d "$TFC_TEXMFCONFIG/$relDir"; then
    setupMktexDir
    mktexdir "$TFC_TEXMFCONFIG/$relDir" || abort "could not create directory \`$TFC_TEXMFCONFIG/$relDir'"
  fi

  if test -f "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE"; then
    needsLSRUpdate=false
    test -w "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE" || rm -f "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE"
  else
    needsLSRUpdate=true
  fi

  if test -f "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE"; then
    cat <"$TFC_TEMP/$TFC_ID/out/$TFC_FILE" >"$TFC_TEXMFCONFIG/$relDir/$TFC_FILE" ||
      abort "failed to write new file \`$TFC_TEXMFCONFIG/$relDir/$TFC_FILE'"
  else
    cp "$TFC_TEMP/$TFC_ID/out/$TFC_FILE" "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE" ||
      abort "failed to copy \`$TFC_TEMP/$TFC_ID/out/$TFC_FILE' to \`$TFC_TEXMFCONFIG/$relDir/$TFC_FILE'"
    chmod 644 "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE" 2>/dev/null
  fi
  if $needsLSRUpdate; then
    mktexupd "$TFC_TEXMFCONFIG/$relDir" "$TFC_FILE"
  fi
  echo "$TFC_TEXMFCONFIG/$relDir/$TFC_FILE"
  (exit 0); return 0
}

find_file()
{
  get_info
  kpsewhich -format="$kpseFormat" -progname="$kpseProgArg" "$TFC_FILE"
}

help()
{
  cat <<eof
Usage: $progname [option] ...

Valid options:
    --reldir       specify directory relative to texmf root
    --infile       specify input file
    --emptyinfile  create an empty input file
    --map          specify map file
    --texmfconfig  texmf tree for config files
    --mktexdir     full path of mktexdir
    --mktexupd     full path of mktexupd
    --tmp          temp directory
    --id           identity string (generated when running command co)
    --file         specify configuration entry from map file
    --cmd          command to execute
    --help         display this help

Valid commands (--cmd) are:
    co             check out
    ci             check in
    find           look up source for file
    mapfile        display path name of map file
eof
}

show_map()
{
  setupMap
  echo "$TFC_MAP"
}

TAB='	'
SPACE=' '
NL='
'
createEmptyFile=false

STD_IFS="$TAB$SPACE$NL"
while
  case $1 in
    --reldir) relDir=$2; shift;;
    --infile) orig=$2; shift;;
    --emptyinfile) createEmptyFile=true;;
    --map) TFC_MAP=$2; shift;;
    --texmfconfig)
           TFC_TEXMFCONFIG=$2; shift;;
    --mktexdir)
           TFC_MKTEXDIR=$2;;
    --mktexupd)
           TFC_MKTEXUPD=$2;;
    --tmp) TFC_TEMP=$2; shift;;
    --id)  TFC_ID=$2; shift;;
    --file)TFC_FILE=$2; shift;;
    --cmd) TFC_CMD=$2; shift;;
    --help) TFC_CMD=help;;
    "") break;;
    *) abort "unknown option \`$1'; try $progname --help"; (exit 1); exit 1;;
  esac
do test $# -gt 0 && shift; done

case $TFC_CMD in
  ci) check_in;;
  co) check_out;;
  find) find_file;;
  mapfile) show_map;;
  help) help;;
  "")
    abort "no command; try $progname --help"; (exit 1); exit 1;;
  *)
    abort "unknown command \`$TFC_CMD'; try $progname --help"; (exit 1); exit 1;;
esac
